Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-13383

CVE-2018-13383MEDIUM

Fortinet FortiOS and FortiProxy

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  L    4.3   .3365   98.3   YES

AFFECTED
  Product                          Versions                                                                                                                            Fixed
  Fortinet FortiOS and FortiProxy  FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier, FortiProxy 2.0.0, 1.2.8 and earlier –  —

TIMELINE
  Jul 6   Reserved by fortinet
  May 29  Published (CNA: fortinet)
  Jan 10  Added to CISA KEV, remediation due 2022-07-10

CWE-787 · CNA: fortinet · CVSS v3.1 · 3 references · KEV due July 10, 2022

Description

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 6, 2018	Reserved	Reserved by fortinet
May 29, 2019	Published	Published (CNA: fortinet)
January 10, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-07-10

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Fortinet	Fortinet FortiOS and FortiProxy	—	FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier, FortiProxy 2.0.0, 1.2.8 and earlier	—

Weaknesses

CWE-787

References (3)

https://fortiguard.com/advisory/FG-IR-18-388 [x_refsource_CONFIRM]
https://fortiguard.com/advisory/FG-IR-20-229 [x_refsource_CONFIRM]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13383 [government-resource]

Authoritative record: CVE-2018-13383 at cve.org

Vendors: fortinet

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-13383 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.